Update write permissions and log into ghcr.io for release (#942)

.github/workflows/release.yaml

@@ -94,6 +94,8 @@ jobs:
     needs: [quality-gate]
     # due to our code signing process, it's vital that we run our release steps on macOS
     runs-on: macos-latest
+    permissions:
+      packages: write
     steps:
       - uses: docker-practice/actions-setup-docker@v1
 
@@ -128,6 +130,8 @@ jobs:
       - name: Build & publish release artifacts
         run: make release
         env:
+          GHCR_USERNAME: ${{ github.actor }}
+          GHCR_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
           DOCKER_USERNAME: ${{ secrets.TOOLBOX_DOCKER_USER }}
           DOCKER_PASSWORD: ${{ secrets.TOOLBOX_DOCKER_PASS }}
           # we use a different token than GITHUB_SECRETS to additionally allow updating the homebrew repos